Nortel Networks 553-3001-211 manual 560 of 894 NT8D14 Universal Trunk card

Page 560 of 894 NT8D14 Universal Trunk card

Card control functions

Control functions are provided by a microcontroller, a card LAN interface, and signaling and control circuits on the NT8D14 Universal Trunk card.

Microcontroller

The NT8D14 Universal Trunk card contains a microcontroller that controls the internal operation of the card and the serial card LAN link to the controller card. The microcontroller controls the following:

•reporting to the CE CPU through the card LAN link:

—card identification (card type, vintage, and serial number)

—firmware version

—self-test status

—programmed configuration status

•receipt and implementation of card configuration through the card LAN link:

—programming of the codecs

—enabling/disabling of individual units or entire card

—programming of input/output interface control circuits for administration of trunk interface unit operation

—maintenance diagnostics

—transmission pad settings

Card LAN interface

Maintenance data is exchanged with the common equipment CPU over a dedicated asynchronous serial network called the Card LAN link.

Signaling and control

The signaling and control portion of the Universal Trunk card works with the CPU to operate the card hardware. The card receives messages from the CPU over a signaling channel in the DS-30X loop and returns status information to the CPU over the same channel. The signaling and control portion of the card

553-3001-211 Standard 2.00 September 2004